VCP-DCV vSphere Security Practice Question
An administrator is configuring a distributed switch and needs to ensure that all virtual machine traffic on a specific VLAN is isolated. The administrator creates a port group with VLAN ID 100. However, a security scanner reports that packets from this VLAN are appearing on other VLANs. Which security policy setting on the distributed switch should the administrator verify?
⚠ Common exam trap
A common mix-up: candidates confuse VLAN trunking (which controls multi-VLAN forwarding) with promiscuous mode (which controls traffic visibility), leading them to incorrectly select promiscuous mode as the cause of VLAN leakage.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
VLAN trunking
The VLAN trunking policy on a distributed switch controls whether a port group can pass multiple VLAN IDs (trunk mode) or is restricted to a single VLAN (access mode). When VLAN trunking is enabled, the port group may forward traffic from VLAN 100 onto other VLANs if the virtual switch is configured to allow it, breaking isolation. The administrator should verify that VLAN trunking is disabled (set to 'Reject') to ensure strict VLAN isolation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
MAC address changes
Why it's wrong here
This controls whether guest can change MAC.
- ✗
Forged transmits
Why it's wrong here
Forged transmits control MAC spoofing.
- ✓
VLAN trunking
Why this is correct
VLAN trunking ensures proper tagging.
- ✗
Promiscuous mode
Why it's wrong here
Promiscuous mode allows all traffic to be seen.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This VCP-DCV practice question is part of Courseiva's free VMware certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the VCP-DCV exam.